While transforming a purchase order into vendor bill is it possible to bill only the items that are received?

As far as I know, transforming a purchase order into a vendor bill will take all the items and quantities. This would be because you could pay on the whole po before it is fully received. To accomplish what you are describing, you would transform the po, and then query up the item receipt data in order to remove/change the lines on the vendor bill.

Also if you disable the Bill in Advance of recipt preference it will fix this as well

Thank you for your inputs. Not what I was hoping for though, will have to write custom logic to handle for one specific vendor.